Thermal properties and phase transitions in (NH4)3ZrF7

被引：15

作者：

Fokina, V. D. ^{[1
]}

Gorev, M. V. ^{[1
,2
]}

Bogdanov, E. V. ^{[1
,3
]}

Pogoreltsev, E. I. ^{[1
,2
]}

Flerov, I. N. ^{[1
,2
]}

Laptash, N. M. ^{[4
]}

机构：

[1] RAS, Siberian Dept, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

[2] Siberian Fed Univ, Krasnoyarsk 660074, Russia

[3] Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia

[4] RAS, Far Eastern Dept, Inst Chem, Vladivostok 690022, Russia

来源：

JOURNAL OF FLUORINE CHEMISTRY | 2013年 / 154卷

关键词：

Cubic fluorides; Phase transitions; Entropy; Thermal dilatation; Permittivity; Pressure effect; AMMONIUM HEPTAFLUOROZIRCONATE; ORIENTATIONAL DISORDER; X-RAY; CRYSTALS; HEPTAFLUOZIRCONATE; (NH4)(3)NBOF6; DIFFRACTION; RELAXATION; K3ZRF7;

D O I：

10.1016/j.jfluchem.2013.07.001

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The heat capacity, thermal dilatation, permittivity, and T-p phase diagram of (NH4)(3)ZrF7 have been studied in wide temperature and pressure ranges. Two phase transitions were found in addition to previously known structural transformations. The stability of crystal phases to temperature and pressure has been examined and a possibility of transition between two cubic phases has been discussed. The total excess entropy change Sigma Delta S-i = RIn6 is characteristic for the order-disorder processes, but its stepwise increase is not consistent with the structural model associated with the strong disorder assumed in the initial cubic phase. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：1 / 6

页数：6

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